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Academic literature on the topic 'Air passageway'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Air passageway"

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Song, Xin-Yi, Qing-Chang Lu, and Zhong-Ren Peng. "Spatial Distribution of Fine Particulate Matter in Underground Passageways." International Journal of Environmental Research and Public Health 15, no. 8 (July 25, 2018): 1574. http://dx.doi.org/10.3390/ijerph15081574.

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The unfavorable locations of underground infrastructures and poor ventilation facilities can result in the deterioration of enclosed air quality. Some researchers have studied air quality and ventilation measures in different types of underground buildings. However, few studies have investigated the pollution in pedestrian passageways connecting underground structures. Hence, in this paper, we attempted to investigate the spatial distribution of fine particulate matter (PM2.5) in underground passageways. First, measurements were designed and conducted in a pedestrian passageway beneath the Shanghai South Railway Station, Shanghai, China. Second, numerical simulations were performed based on computational fluid dynamic (CFD) technology. Finally, the numerical simulations were extended to examine impacts of the ventilation measures on PM2.5 concentration with different inlet positions and air velocity in underground passageways. The simulation results showed good agreement with the experimental data, and the numerical model was validated to be an effective method to investigate the spatial distribution of PM2.5 in underground passageways. Results suggest that building additional entrances is an advisable method for improving air quality in the underground passageways of the Shanghai South Railway Station, while jet fans are not recommended. Findings of this study offer suggestions for mitigating PM2.5 pollution in underground passageways.
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Adamčík, Martin, Tomáš Svěrák, and Peter Peciar. "PARAMETERS EFFECTING FORCED VORTEX FORMATION IN BLADE PASSAGEWAY OF DYNAMIC AIR CLASSIFIER." Acta Polytechnica 57, no. 5 (October 31, 2017): 304. http://dx.doi.org/10.14311/ap.2017.57.0304.

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<p>Air classification of particulate materials is a method of classifying particles into coarse and fine fractions based on their size, density, or shape. Performance of the rotor air classifier is affected by operating parameters which include the classifier rotor speed, air inlet velocity and material feed rate. Effects of operating and structural parameters on turbulent flow field patterns inside of a dynamic air classifier are investigated. Increasing the computing power, together with new turbulence models and<br />approaches, to simulate complex fully turbulent problems by solving Navier-Stokes equations allows studying and capturing smaller flow structures and properties more accurately. Velocity vector maps for varying operating parameters are studied by means of numerical simulations. The experimental section includes a visualization of flow patterns and velocity vector maps in the rotor region by the use of the particle image velocimetry (PIV). Results are compared and discussed.</p>
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Gao, Ran, Angui Li, Wenjun Lei, Yujiao Zhao, Ying Zhang, and Baoshun Deng. "Study of a proposed tunnel evacuation passageway formed by opposite-double air curtain ventilation." Safety Science 50, no. 7 (August 2012): 1549–57. http://dx.doi.org/10.1016/j.ssci.2012.03.007.

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Li, Da. "Design for New Type Centrifugal Fan and Passageway of the Air Conditioner Indoor Unit." IOP Conference Series: Earth and Environmental Science 632 (January 14, 2021): 052003. http://dx.doi.org/10.1088/1755-1315/632/5/052003.

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Yue, Yu, Wen Jiang, Zhang Zhang, Chen Wang, Zong You Shao, Zhi Min Tang, Wei Dong Shen, Ke Li, and Guang Hui Liu. "Investigations of the Energy-Saving Technology of a Cloud Computing Data Center." Applied Mechanics and Materials 556-562 (May 2014): 6228–31. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.6228.

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This paper shows the energy consumption distribution of current data center, presents some effective energy-saving measures to reduce the energy consumption of a cloud computing data center. Raise an effective way to optimize the air distribution of the data center such as sealing the cold passageway. Through the use of ADU can solve the local overheating inside the equipment cabinet. The use of the modularization UPS, the high-voltage direct current technology and harmonic suppression can improve the efficiency of the power supply system.
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Wang, A. Cheng, Kuan Yu Chen, Ken Chuan Cheng, and H. H. Chiu. "Elucidating the Effects of Helical Passageways in Abrasive Flow Machining." Advanced Materials Research 264-265 (June 2011): 1862–67. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.1862.

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Conventional AFM have difficulty achieving uniform roughness of an axial distribution in circular hole polishing due to limited unitary axial motion of abrasive media. Therefore, this work develops mechanism designs for different passageways to obtain multiple flowing paths of an abrasive medium, whose flowing behavior enhances polishing effectiveness by increasing the abrasive surface area and radial shear forces. The motion of the abrasive medium is studied by utilizing the design of the mold cores, which mold shapes include the circular passageway and helical passageway. The optimum design of the different passageways is then verified using CFD-ACE+ numerical software. Analytical results indicate that the optimum design is the mechanism with a passageway of six helices. Furthermore, surface roughness measurements demonstrate the increase in uniformity and the roughness improvement rate (RIR). Experimental results for surface roughness indicate that roughness deviation of six helices passageway of approximately 0.1001 m Ra is significantly better than those on a circular passageway of around 0.1760 m Ra. Additionally, the six helices passageway is also superior to circular passageway in reducing roughness improvement rate (RIR) by roughly 85% compared with RIR 75% for the circular passageway.
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Hirabayashi, H., and H. Shimada. "Panel Discussion 2: ^|^ldquo;Management of Air and Food Passageway Foreign Bodies^|^rdquo;^|^mdash;Introduction." Nihon Kikan Shokudoka Gakkai Kaiho 65, no. 2 (2014): 148. http://dx.doi.org/10.2468/jbes.65.148.

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Gao, Ran, Angui Li, Wenjun Lei, Yujiao Zhao, Ying Zhang, and Baoshun Deng. "A novel evacuation passageway formed by a breathing air supply zone combined with upward ventilation." Physica A: Statistical Mechanics and its Applications 392, no. 20 (October 2013): 4793–803. http://dx.doi.org/10.1016/j.physa.2013.06.030.

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Janczarek, Iwona, Izabela Wilk, Anna Wiśniewska, Roland Kusy, Katarzyna Cikacz, Martyna Frątczak, and Przemysław Wójcik. "Effect of air temperature and humidity in a stable on basic physiological parameters in horses." Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego 16, no. 3 (September 30, 2020): 55–65. http://dx.doi.org/10.5604/01.3001.0014.4154.

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The aim of the study was to analyse selected air parameters in a stable (microclimate) and the basic physiological parameters of horses housed in the stable in different seasons of the year. The research material was 12 adult hot-blooded horses kept in a brick stable with stalls. Air parameters in the stable (temperature in the passageway, temperature in the stall at two points, relative humidity in the passageway, and relative humidity in the stall at two points) were determined four times in one year, in summer, autumn, winter and spring. Measurements were made with a Bluetooth BLE-LOGGER LB-518 battery-operated cordless thermo-hygrometer at 12 noon at five points in the stable located 300 cm apart. Physiological parameters of the horses, i.e. internal body temperature (Veterinär SC 12 veterinary thermometer), heart rate (Polar ELECTRO OY RS800CX with PolarProTrainer 5.0. software), and respiratory rate (with a manual stopwatch) were measured at 6 a.m. and 6 p.m. on each day of the study. The season of the year was found to have a significant influence on the microclimate of the stable. To ensure optimal air humidity, airing of the stable should be limited only in winter and periodically in autumn. It is also worth emphasizing that the stable microclimate has a marked effect on the basic physiological parameters of horses. High temperature and relative humidity in the stable can cause unfavourable changes in the form of an increase in evening body temperature in the summer and a decrease in the winter. The remaining parameters, i.e. heart rate and respiratory rate, can also unfavourably increase, mainly in the summer. Horses should have fewer problems maintaining normal physiological parameters in winter, even fewer in autumn, and the fewest in spring.
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Cheng, Ken Chuan, Kuan Yu Chen, A. Cheng Wang, and Yan Cherng Lin. "Study the Rheological Properties of Abrasive Gel with Various Passageways in Abrasive Flow Machining." Advanced Materials Research 126-128 (August 2010): 447–56. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.447.

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Abrasive flow machining (AFM) is a simple and efficient method to remove recasting layers making by wire electrical discharge machining (WEDM). However, conventional AFM methods have difficulty achieving uniform roughness of an axial distribution in circular hole polishing due to limited unitary axial motion of abrasive media. Therefore, this work develops mechanism designs for different passageways to obtain multiple flowing paths of abrasive medium, whose flowing behavior enhances polishing effectiveness by increasing the abrasive surface area and radial shear forces. The motion of the abrasive medium is studied by utilizing different mold cores, which mold shapes include the circular, hollow and helical passageway. The optimum design of the passageways is then verified using CFD-ACE+ software, numerical results indicate that passageway with six helices performed better in the uniform surface roughness than others’ do. Experimental results show that roughness deviation of six helices passageway of approximately 0.100 m Ra is significantly better than those on a circular passageway of around 0.1760 m Ra. Additionally, the six helices passageway is also superior to circular passageway in reducing roughness improvement rate (RIR) by roughly 87% compared with RIR 67.7% for the circular passageway.
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Dissertations / Theses on the topic "Air passageway"

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Abdelhamid, Ibrahim Younouss, and О. Г. Аврунін. "Analysis of aerodynamic simulation of air flow modes with nasal breathing disorders." Thesis, ХНУРЕ, 2018. http://openarchive.nure.ua/handle/document/10597.

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There is studing the most important aerodynamic processes occurring in the nasal airway specifically with breathing disorders, and to identify the most important respiratory functions of the upper respiratory system
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Conference papers on the topic "Air passageway"

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Aguilar Hernandez, Danilo, Elliot Sullivan-Lewis, and Vincent McDonell. "Adaptation of a 60kW Commercial Natural Gas Fired Microturbine for Operation on Diesel and Diesel-Water Emulsions." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63846.

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Injection of water into a combustor is a proven method for reducing emissions of particulate and nitrogen oxide emissions beyond what can be achieved by reducing firing temperature through fuel lean operation. However, the added complexity and cost associated with a standalone water injection circuit makes this method less desirable. A method for reducing the complexity of water injection is to premix the fuel with water as an emulsion and injecting this mixture through the existing liquid fuel circuit. In the present study, the gaseous fuel injectors of a commercial micro gas turbine generator were modified to operate on both water-in-oil emulsions and gas fuel. These injectors were installed in an otherwise unmodified engine. The original air-blast injector was modified by adding a central fuel tube and blocking the original gas fuel passages. Dual-fuel operation was achieved by injecting gaseous fuel through the annular passage surrounding the liquid fuel tube. This gas fuel passageway is used for both gas fuel delivery and for introduction of air that is used to assist in the liquid fuel atomization. The atomization behavior of these injectors has been characterized using laser diffraction and high speed video for water mass fractions of between zero and 0.5, and air-to-liquid ratios between zero and one. Additionally, pollutant emissions were measured from an engine equipped with these modified injectors and operated over the same range of water mass fraction and air-to-liquid ratio. The results confirmed viability of the modified injectors for introducing water in form of an emulsion. It was also observed that, while atomization performance was altered in a minor way, the complex interaction between evaporation and subsequent mixing resulted in non-monotonic impact on NOx emissions.
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Hu, Wei, Eugene Cook, and Norman M. Wereley. "Characterization and Modeling Magnetorheological By-Pass Porous Damper Exploiting Flow Through a Porous Media." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14820.

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A magnetorheological (MR) fluid bypass damper exploiting flow through porous media is developed utilizing a valve filled with porous media instead of regular uniform channels to adaptively regulate damping force. The MR damper includes a cylinder containing an MR fluid, a movable piston and a bypass valve. The bypass valve filled with porous media is used to provide a magnetically energizable passageway. A stationary magnetic coil is wrapped around the bypass valve, isolated from the MR fluid and external to the device. The axis of the bypass valve is collinear with the center of the magnetic coil such that the magnetic flux return guide of the coil can be either empty (air) or any high permeability steel material which provides flexibility for damper design. The damper is applied with sinusoidal excitations. Equivalent viscous damping is used to characterize the damper. It is shown that the MR damper exploiting flow through porous media can provide high controllable damping force using a compact damper configuration. To describe the behavior of the MR damper, the flow path in the porous media is considered as a multiple-pipe system. Using quantitative and empirical analysis of the magnetic and rheological properties of MR fluid flowing through the porous media in the bypass valve, the controllable damping performance of the damper is well predicted using the model, and the force-displacement hysteresis behavior of the damper can also be described by the analytical model. The model is validated by the experimental data at different frequencies and applied currents.
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Granovskiy, Andrei, Valery Kostege, Sergey Chernyshev, and Vladimir Vassiliev. "Impact of the Pre-Swirl Nozzle Location on the Air Transfer System (ATS) Characteristic." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59355.

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In most industrial turbines the cooling air for rotating turbine blades, is extracted from the compressor and transferred via passageways in the stationary parts and the rotor to the blade roots. These passages form the stator-rotor air transfer system (ATS). In stationary part of the ATS the air is usually pre-swirled in the direction of rotation to reduce the temperature and to minimize the losses in the transition area. This paper presents the investigations of the impact of the pre-swirl nozzle location on the ATS characteristics. Two ATSs have been compared. Both have a similar design, with the main difference related to the position of a pre-swirl nozzle. In the first system the pre-swirl nozzle is located at the inlet, and in the second it is located at the outlet of the stationary part of the ATS. The detailed flow structure and characteristics of both systems have been calculated using commercial CFD code. The 3-D calculations provide better insight into the dominant physical mechanisms in complex, rotating, turbulent flow and allow the calculation of the performance of these systems under various conditions. The CFD calculations have been used for the calibration of the cooling system hydraulic model, and the latter was compared with the available measured data. The study showed that the two ATSs considered have very similar characteristics (i.e. similar reduction of cooling air temperature and similar losses) despite the fact that the flow structure is significantly different. Therefore, this design can be considered as neutral to the pre-swirl nozzle location, and this is a positive feature ensuring flexibility of the system.
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Burns, Thomas, Thomas Finn, Emily Garrant, Frank Hemsing, Kathleen Lewicki, Ryan Pane, Laurel Kuxhaus, and Kevin Fite. "Design of a Multi-Function Walker/Cane for Enhanced Assistive Function." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80299.

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In the United States over 4 million people use canes and over 1.5 million people use walkers [1]. Of those walker users 77% are 65 years or older. Over 47,000 emergency room visits each year are a result of falls involving walkers and canes. Injuries from walker accidents are seven times more prevalent than cane accidents [2,3]. Many of these injuries result from the unavailability of a suitable assistive device for a patient’s current environment. For example, a walker may not allow patients to maneuver around a living room. Patients often resort to the dangerous practice of furniture walking (using surrounding objects to aid in balance) when environmental factors such as insufficient space preclude the use of a walker-type assistive device. Narrow passageways are particularly challenging to navigate for those individuals using a walker.
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Allen, Cody W., Chad M. Holcomb, and Mauricio de Oliveira. "Estimating Recoverable Performance Degradation Rates and Optimizing Maintenance Scheduling." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75267.

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Many of the components on a gas turbine are subject to fouling and degradation over time due to debris buildup. For example, axial compressors are susceptible to degradation as a result of debris buildup on compressor blades. Similarly, air cooled lube oil heat exchangers incur degradation as a result of debris buildup in the cooling air passageways. In this paper, we develop a method for estimating the degradation rate of a given gas turbine component that experiences recoverable degradation due to normal operation over time. We then establish an economic maintenance scheduling model which utilizes the derived rate and user input economic factors to provide a locally optimal maintenance schedule with minimized operator costs. The rate estimation method makes use of statistical methods combined with historical data to give an algorithm with which a performance loss rate can be extracted from noisy data measurements. The economic maintenance schedule is then derived by minimizing the cost model in user specified intervals and the final schedule results as a combination of the locally optimized schedules. The goal of the combination of algorithms is to maximize component output and efficiency, while minimizing maintenance costs. The rate estimation method is validated by simulation where the underlying noisy data measurements come from a known probability distribution. Then, an example schedule optimization is provided to validate the economic optimization model and show the efficacy of the combined methods.
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Sullivan-Lewis, Elliot, and Vincent McDonell. "Predicting Flameholding for Hydrogen and Natural Gas Flames at Gas Turbine Premixer Conditions." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43627.

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Lean premixed gas turbines are one of the most common methods for stationary power generation. By creating a homogeneous mixture of fuel and air upstream of the combustion chamber, temperature variations are reduced within the combustor, which reduces emissions of nitrogen oxides. However, by premixing fuel and air, a potentially flammable mixture is established in a part of the engine not designed to contain a flame. If the flame propagates upstream from the combustor (flashback), significant engine damage can result. While significant effort has been put into developing flashback resistant combustors, these combustors are only capable of preventing flashback during steady operation of the engine. Transient events (e.g. auto ignition within the premixer, pressure spikes during ignition) can trigger flashback that cannot be prevented with even the best combustor design. In these cases, preventing engine damage requires designing premixers that will not allow a flame to be sustained. Experimental studies were conducted to determine under what conditions premixed flames of hydrogen and natural gas can be anchored in a simulated gas turbine premixer. Tests have been conducted at pressures up to 9 atm, temperatures up to 750 K, and free stream velocities between 20 and 100 m/s. Flames were anchored in the wakes of features typical of premixer passageways, including cylinders, steps and airfoils. The results of this study have been used to develop tools that predict when a flame remains anchored to a particular feature.
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